Stamp-mill



. 3'.Sheets-$1116et 1.

J. C. BUTTERFIBLD.

Stamp Mill.

No. 230,611. Patented Aug. 3,1880.

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J. 0.BUTTBRF1BLD. Stamp Mill.

No. 230,611. y Patented Aug. 3,1880.

Inventor:

^ .FETES. PHOTO-UTHOGRAPIIERr'WASHINGON. D. C.

3 Sheets-Sheet 2;

3 Sheets-Sheet 3.

J. 0. BUTTERFIBLD.

Stamp Mill.

Patented Aufg. 3,1880,

Inventor.'

Witnesses.' v I y f -fzalmh "fm PKOTD-LITNOGRPHER. WA

UNITED STATES PATENT OFFICE.

JOHN C. BUTTERFIELD, CHICAGO, ILLINOIS.

STAMP-MILL.

SPECIFICATION forming .part of Letters Patent No. 230,611, dated August3, 1880.

Application filed October 23, 1879.

To all whom it may concern:

Be it known that I, JOHN C. BUTTERFIELD, of Chicago, Cook county, in theState of Illinois, have invented new and useful Improvement-s inStamp-Mills for Crushing Orcs and for other Analogous Purposes; and I dohereby declare that the following is a full description of the same.

Heretofore the stamps of ore-crushers have generally been actuated byrevolving cams or tappets, which raise the stamps and permit them tofall by their gravity only. Steam has also been occasionally employed todrive the stamps.

M'y invention consists, first, in a frame composed of two correspondingside plates secured the together' by tie-bolts and adapted to supportbearings of the operative parts, and provided with a walking-beam, toone end whereof av stamp-rod is connected with an interposedshock-absorbing cushion, and to the other end whereof a pneumaticcylinder is attached, whereby the driving-power is transmitted; second,in a parallel brace jointed to the frame and to the stamp-rod, wherebyits parallelism of motion is preserved; third, in an elastic buer tocushion the downward motion of the parallel brace; fourth, in theadjustable coupling between said brace and the stamprod, whereby thebrace may be made parallel to the walking-beam; fifth, in devicesformount.

ing and operating the chute; sixth, in the structure of themortar-block; seventh, in the arrangements of inlets to the mortar andthe amalgam plates surrounding the same.

I do not claim herein anything as to the principles involved or generalmode of operation of the driving mechanism. I will, however, brieiiydescribe the operative parts, having reference to the accompanyingdrawings, wherein- Figure 1 is a perspective view of my inachine. Fig. 2is a sectional elevation of the same. Figs. 3 and 4 are details of thedriving mechanism. Fig. 5 is a sectional elevation of the mortar. Figs.6, 7, 8, and 9 are details of Y the same.

A is the metallic frame of my mill, which I prefer to construct of twoplates of cast metal attached by bolts a c, which rigidly hold saidplates in proper position and constitute a single rigid structure. Atthe top the frame A is provided with boxes b for bearings for ,thejournal O of the walking-beam B. At the rear of the frame A, near thebottom, there are boxes d for' the crank-shaft D, which receives motionfrom the driving-motor by means of the pulley E upon said shaft D.

Between the crank of shaft D and the rear end of the beam B there is apneumatic cylinder, F, and piston Gr, one of said parts being mountedupon the crank and the other connected to the walking-beam. In thedrawings said cylinder is represented as mounted upon the crank; but, sofar as principles are concerned, it is immaterial which of said parts isattached to the crank and which to the walking-beam. For convenience,however, the description will be coninedto the arrangement shown.

As the crank D is rotated the cylinder F is caused to move up and down,and theinclosed air is alternately compressed in the lower and upperends of the cylinder, between the piston and the respectivecylinder-heads. l

When the resultant pressure is sufficient to overcome the resistance thepiston and the parts connected therewith are carried along with thecylinder, and the walkingbeam B is thereby oscillated in its bearings.The perfect elasticity of the air inclosed in the cylinder is such thatthe shaft D can be revolved rapidly, so as to impart a correspondinglyrapid oscillation to the beam B without strain and shock upon the parts.

At the front end of the walking-beam the stamp-rod H is attached by atransverse bearing, and at its lower end the steel or chilled iron shoeI is attached. The stamp-rod H is made in two parts, united by a screwor otherwise, so as to be adjustable as to length to compensate forwearing away ofthe stamp, shoe, and die.

The 'coupling which attaches the stamphead H to the beam B is composedof three metallic plates, e c j', with interposed elastic cushions J J.'The plate f is connected to the beam B by transverse journals K, anddoes not touch the rod, while theplates e c are attached to the rod Hand do not touch the plate f. rIhe vibration in the rod H at every blowof the stamp I is therefore ab- IOO sorbed in the elastic cushions J.,and is not transmitted to the beam B and frame of the machine.

The inertia ofthe stamp on its upward motion with a rapid speed isconsiderable, and'it is desirable to cushion it to prevent wear of' theboxes. For this purpose I place a pneu matic cylinder, L, upon trunnionsbetween the side plates of the frame and couple its pistonrod M to thewalking-beam B in front of the journal C. At each upstroke of the stampair is compressed in the top of the cylinder L, and said pressureincreases until the upward motion of the stamp is checked, but with acushioning effect as perfect as is the elasticity ot' the inclosed air.

The stamp-rod H is required to have a vertical movement, and I thereforeprovide aparallel brace, N, which is pivoted to the frame A at sonicpoint vertically below the journal C, and when said bar N has beenadjusted in parallelism with the beam B the rod H will thereafterpreserveits vertical position through all parts of its stroke.

The parallel brace N is composed of two bars divergent from thescrew-sleeve O upon the rod H. At their front ends they are bolted to ayoke-piece, g, which embraces the sleeve O and is pivoted to it at eachside. At their rear ends said bars are each bolted to a cappiece, h,which is pivoted to the side plate, A, vertically below thejournal C.Each of said cap-pieces has a bell-crank arm, which at each downwardmovement ofthe stam p-rod engages with an elastic buffer, q, whereby7the downward movement of said brace is cushioned, so as to prevent theshock to the parts and joints consequent upon the sudden arrest of thefall of the staln p.

The rod H `has an axial bore at one end, which is tapped with a femalethread to receive the coupling-rod t', and the rod H may be leugthenedor shortened by screwing said rod 1T out of or into said bore. A set-nuton the rod 'L' serves to hold it in position. The rod H has also anexternal screw-thread, 7c, the

threads whereof are of equal pitch with the' screw-thread of the rod i,so that when it is desired to lengthen or shorten the rod H it is onlynecessary to loosen the jam-nut on the rod t' and loosen theclamp-screws of the sleeve O, when the rod H may be rotated with awrench and its length increased or diminished aceordin gl y.

I think it desirable to take the thrust and shock oft' the screw-threadof rod t', as the threads may after a time be stripped, and I thereforemake a transverse slot, l, through the upper end of the rod H, so as toexpose the lower end of rod i and permit the insertion of a block, m,therein under said rod.

A hopper, l), is placed between the side plates of the frame A, with itsinlet-mouth a outside of said frame and its discharge-opening p at thebottom between the frame-plates and immediately over the chute Q, whichin turn discharges into the stamp-mortar.

The necessary water may be introduced at the rear end ofthe chute Q.

The chute Qis mounted at its front end and jointed to a standard, R, thelower end of which is screwed into a saddle-piece, o", which straddlesand rides upon the bolt a.

At its rear end'the chute Q, is mounted upon the rock-shaft S, )rovidedwith a pendent arm, t, which is coupled to the crank D by a rod, s, `andthe chute is thereby caused to reciprocate endwise with every revolutionof the crank I), and its discharge into the mortar is therebyfacilitated.

The mortar is, primarily, a heavy block, T, of cast metal, having in itsupper side a coni- .cal cup or depression, u, within which the die U isplaced. A conical ring, o', fits the die and fills the space between itsupper edge and the upper edge of the conical cup a, as shown. Thepurpose of this structure is asifollows: The die will be constantly wornaway on its upper surface by use, and it will therefore be necessaryfrom time to time `to raise it up, so as to restore its level. Byremoving the rin g 'v the die may be readilyreached and raised up, andits level restored by placing plates of metal under it until it standsagain at the proper height. The upper surface of the rin g c is inclinedinward and downward from all sides toward the surface of the die, sothat the ore and slime which are upon said `ring-surface will beconstantly returned to the die.

The ring n may be secured in place by screws or otherwise, as may bemost convenient.

The mortar is surmounted and its upper edge surrounded by a frame, V,and a cover, w, which is removable.

At the rear side the inlet-chute W receives the ore and slime from thechute Q, and d'elivers it through a divided passage, y y, at two pointsinto the mortar, and in directions which may be radial to the die, so asto deliver the ore directly to the center of the stamp.

The surface of the frameVbehind the stamp is covered with copper amalgamplates a', and these plates are provided with horizontal IIO troughs b',which are filled with mercury` to i catch and hold the metal in theslime, which splashes from under the stampat each blow. As the troughs breceive constant addition of metal and powdered stone, they constantlyoverflow, the upper into the lower one,\until nally discharged at aproper outlet, whence the amalgam may be conveyed away to be reducedelsewhere. The inner surface of the roof of the mortar-frame V is alsolined with amalgam plates, the linear surface of which is increased bypendent plates Y, both sides of which are amalgamated and receive thesplash from the stamp.

The front side of the mortar-frameVis provided with screens A', whichare stretched upon removable frames fitted to the frame V, and securedin `place at the front by the button .fr or by other suitable means. Thescreens prevent the escape of fragments too large to be received uponthe amalgam plates, and re IIS turn them to the mortar. Outside of thescreens A there are covers B', the inner surfaces of which are alsoamalgam surfaces and receive the slime'which is splashed through thescreen A.

Around the front side of the mortar there is a projecting table, D', theupper surface of which inclines downward and outward, and is providedwith a number of concentric grooves or riffles, d', in which mercury isplacedto catch the drip from the cover-plates B. The grooves d receivethe drip from the amalgam plates, and overflow one into the other untilthe outlet g is reached, whence the amalgam may be conveyed away in atrough or pipe forI reduction elsewhere, as heretofore set forth.

The top plate `of the mortar-frame is provided with a suitable number ofspherical sockets, c", in which the heads of the clampbolts 7c areseated, so that when the said frames are to be removed said bolts may bereleased and turned up ont of the way without being removed. Theclamp-bolts securev and hold the cover-plates B and the screenframesalso. A

At one side in the cover of the mortar-frame there is an opening, E',closed by a removable cover, c', and, if it is desired, a hopper may beiitted to said opening for the introduction of soft slime or auriferousmud, which will notl feed freely through the hopper P and chute Q.

Having described my invention,- what I claim as new is l. A stamp-millthe frame whereof is formed in two side plates, A, bearing awalking-beam, B, at top, combined with a stamp-rod suspended from oneend of said walking-beam byv an elastic shock-absorbing coupling. J, anda pneumatic cylinder and piston driven bya crank, D, attached to theopposite end for the purpose of driving the stamp, in the manner A setforth.

2. A stamp-mill the frame whereof is formed of two side plates, A, witlla walking-beam, B, through which power is transmitted to the rod andstamp,combined with a hopper, P, andA reciprocating chute Q, locatedbetween saidl plates A, as set forth.

3. Astamp-rod, H, snspei'ldedfrom and actuated by a walking-beam, B,combined with al parallel brace, N, pivoted to the frame A vertically'beneath the walking-beam journal and adjusted parallel with said beam'to preserve the vertical position of the stamp-rod throughoutits stroke.

4. A stamp-rod, H, suspended from and actuated by a walkin g-beam, and aparallel brace, N, combined with an elastic buffer, q, to cushionthedownward motion of said parallel brace, as and for the purpose setforth.

5. Astamp-rod, H, suspended from and actuated by a walking-beam, B, anda parallel brace, N, pivoted to the frame A vertically beneath thejournal of said beam, combined with an adjustable sleeve, O, on said rodH anda yoke. g, pivoted to said sleeve and rigidly secured to saidbrace, as set forth.

6. The chute Q, mounted at its front end upon vthe hinged standard R,and saddle-piece r, which straddles and rests upon the bolt a, and itsback end supported upon the rockshaft S, combined with the pendent armtandrod s, whereby the said rock-shaft is connected with the crank D andthe chute Q is caused to reciprocate with each revolution of said crank.

7. The stamp-rod constructed in two parts,

-H and t', united by a screw-thread, combined with a transverse slot, l,through the part H and a foot-block, m, to receive the downward thrustof part 8. lllhe stamp-rod made in two parts, Hand t', united by ascrew-thread, and provided with a screw-thread, k, of equal pitch withthe thread on rod z', combined with screw-sleeve O at the end of theparallel brace N, whereby when partH is rotated it is raised or lowered,as the case may be, without disturbing the parallelism of brace N andbeamfB.

9. The mortar-block T, provided in its upper surface with the conicalcupa, diefU, and conical ring o, combined with a vertically-moving stamp,as set forth.

l0. A mortar for a stamp-mill, provided with an inlet-chute, W, dividedinto two passages, y y, to deliver the ore at two points in the mortar,as set forth.

l1. In a stamp-mill, the amalgam plates a', with horizontal troughs b',to hold mercury and catch the drip, as set forth.

l2. A stamp-mortar provided with a surrounding screen, A', andamalgamating-plates JOHN C. BUTTERFIELD.

Witnesses: A R. D. O. SMITH,

N. B. SMITH.

IOO

